Mordenite
Mineral (Ca,Na2,K2)Al2Si10O24·7H2O
Take care.
- Fragile: Handle it gently and pack it well; it breaks or crumbles easily.
About it
Cottony tufts of hair-thin fibres and needles in basalt and other volcanic rock; named for Morden, Nova Scotia. Very fragile.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- (Ca,Na2,K2)Al2Si10O24·7H2O
- Hardness (Mohs)
- 3–4
- Specific gravity
- 2.12–2.15
- Streak
- white
- Lustre
- vitreous (glassy), silky, pearly
- Crystal system
- Orthorhombic
- Colours
- colourless, white, yellowish, pink
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.